Hi, I am doing a mockup for dynamically compiled scripts in Apache Lucene (later also painless scripting in elastcsearch), where I tried to use Lookup#defineHiddenClass (with default parameters, so weak and no nestmates - but: for painless scripts of Elasticsearch, nestmates will be great). It all looks great, as sometimes for every query a new class is generated.
The current approach (Java 8, Java 11) uses a Classloader per script, which is mostly OK, but hidden classes would be better, especially under high load with many new classes. The problem I see is: The hidden class and their methods are also hidden from stack traces, so people neither get the script source code reference, nor they get the method, which was called at all. My question is: is it possible to mark such a hidden class in byte code or by a flag to defineHiddenClass() so it is "unhidden"? - I know you can do this by a command line option, but that's for developers and debugging only. In some cases, this is really wanted (like for scripting languages), but code still wants to use the better class unloading. If this is not possible, how about extending the Lookup.ClassOption enum (last parameter of defineHiddenClass), to also pass a flag to show them in stack traces? Uwe ----- Uwe Schindler uschind...@apache.org ASF Member, Apache Lucene PMC / Committer Bremen, Germany https://lucene.apache.org/
